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兰坪盆地大型矿集区多金属矿床的铅同位素组成及铅的来源 总被引:20,自引:3,他引:20
滇西兰坪中、新生代陆相分地中蕴藏有金顶超大型铅锌矿床、白秧坪大型银矿床及羊拉、金满等一系列大、中型铜矿床,矿点、矿化点星罗棋布,为一成矿时代新、矿床规模大、矿床种类丰富的大型矿集区。分布于盆地边缘的矿床与火山活动有一定关系,盆地内部的矿床产于中、新生代沉积岩中。铜矿床沿澜沧江深大断裂带东侧分布,向东至盆地中部,为铅锌银分布区,再向东出现汞锑砷矿化。该矿集区不同矿床的铅同位素组成及铅的来源,可分为三种类型,(1)金顶超大型铅锌矿床以具有低同痊素比值的铅为主,铅的主体来源相当于下地壳铅,整个矿床的铅为下地壳铅与盆地沉积岩铅的混合铅;(2)金满铜矿床及盆增内其它铜铅锌矿床的铅来自盆地沉积岩;(3)位于盆地边缘的着拉铜矿床,早期热水沉积成矿阶段铅的来源与二迭系玄武岩铅一致,为幔源铅,晚期热液成矿阶段铅来自地壳重熔岩浆作用。 相似文献
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细粒嵌布型铜锌硫化矿采用粗磨后混合浮选工艺,具有回收率高和成本低的优势,但对所产出的混合精矿,亟需解决铜、锌、硫之间的高效彻底分离。云南玉溪地区铜锌硫混合粗精矿,其细度为-74μm 75%,含Cu 2.45%、Zn 4.93%、S 31.21%,笔者采用粗精矿再磨-铜、锌、硫选择性浮选分离工艺,研究了再磨细度、药剂种类、用量等因素对各矿物分离效果的影响。当粗精矿再磨细度为-38μm90%时,闭路试验获得品位和回收率均较高的铜、锌和硫精矿产品,铜精矿含Cu 21.00%,Cu回收率84.27%,锌精矿含Zn 48.37%,Zn回收率85.94%,硫精矿含S37.90%,S回收率82.85%,混合精矿中的铜矿物、锌矿物、硫矿物均实现了较彻底的分离。本研究为铜多金属混合精矿的有效分离提供了一种可资借鉴的方法。 相似文献
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含矿流体混合反应与成矿作用的动力平衡模拟研究 总被引:7,自引:0,他引:7
本文在约定热液体系中成矿元素成矿速率(成矿过程中单位时间内单位体积所合成矿元素重量的变化)的基础上。借助于物质-热-化学-成矿四重全耦合的研究思路,构建了均匀热液体系、层状热液体系、岩浆侵入热液体系下成矿元素的迁移、富集、溶解与沉淀作用数值模型。模拟结果表明;(1)硫化物(H2S)和硫酸盐(SO42-)流体的混合反应是成矿热液体系中铅、锌、铁成矿元素成矿的重要控制因素;(2)均匀介质、岩浆侵入或地质构造的存在,对成矿元素在成矿流体运移的速度、流线、温度分布和成矿元素的溶解与沉淀分布都有着各自的特征.不同的成矿环境或成矿背景制约了成矿元素的迁移与富集以及矿体的产出定位。暗示成矿环境及成矿速率对热液体系中成矿元素的沉淀与溶解具重要作用;成矿流体的混合反应是成矿作用发生的重要机制之一。在成矿理论研究中必须充分考虑不同地质构造因素的约束。 相似文献
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江山铅锌金矿选矿试验研究 总被引:1,自引:0,他引:1
针对江山铅锌金矿品位低,矿物组成复杂的特点,采用"铅-锌-硫优先浮选,硫(金)精矿氧化焙烧预处理-焙砂氰化浸金"的工艺,金在铅(金)精矿、锌精矿、硫(金)精矿中的总回收率为81.25%。可使硫(金)精矿中96.89%的硫以二氧化硫的形式得到回收,对原矿的回收率为73.25%;金的作业浸出率达84.76%,对原矿的回收率为31.91%;浸渣中的铁品位达57.99%,对原矿的回收率为26.71%。通过试验研究与分析,确定适宜的选矿工艺及药剂制度,为今后合理开发该区矿石提供技术依据。 相似文献
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《Applied Geochemistry》2006,21(4):563-579
Element concentrations, element ratios and Pb and Zn isotope data are reported for different geologic samples (barren and ore-bearing granites and host rocks), technogenic products (ore concentrates and tailings) and biologic samples (lichens and birch leaves) from the Orlovka–Spokoinoe mining district, Eastern Transbaikalia, Russia, with the aim to trace the sources of Pb and Zn at a local level within the mining site. Lichens and birch leaves were used as receptors of contamination within the mining site. Pb/Zr and Zn/Zr values indicated Pb and Zn enrichment relative to host rocks. Zn isotope data of 15 geologic and 11 lichen samples showed different Zn isotopic signatures with the total range for the geologic suite of −0.4‰ to +1.2‰ and for lichens of +0.4‰ to +1.4‰ in δ66Zn relative to Lyon JMC Zn standard. The source of isotopically heavy Zn within the Orlovka–Spokoinoe mining site could be potentially associated with long-range atmospheric aerosols that also contributed Pb to the studied mining site. Our results demonstrated that Zn isotopes might be used as new tools for Zn source assessment. 相似文献
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《Chemie der Erde / Geochemistry》2021,81(4):125769
In this study, a new flotation approach, a low-alkaline and non-desliming process, was introduced for improving lead and zinc recoveries, lowering production cost and reducing environmental pollution. Lab-scale experiments results show that the new process contributed to the flotation of the complex mixed sulfide-oxide lead and zinc ore regarding two aspects: (1) High alkaline process (pH = 12±) was replaced by low alkaline process (pH = 9±) by using collector WS (a mixture of ethyl thiocarbamate, ammonium dibutyldithiophosphate and dithiophosphate-25) and combined depressant Na2S/ZnSO4/Na2SO3 for lead sulfide flotation; (2) Non-desliming process was successfully achieved by using collector MA (a mixture of ether amine, hydroxyethyl cellulose and polyacrylic acid) and combined depressant SHP/SS (sodium hexametaphosphate/sodium silicate) for zinc oxide flotation. And 43.37% Pb in the Pb concentrate was recovered, the corresponding Pb grade was 52.73%, total 84.42% Zn was recovered by the flotation of zinc sulfide minerals and zinc oxide minerals. Moreover, the two aspects of the new approach were systematically verified from lab-scale to industrial-scale application. The industrial-scale flotation tests show that Pb recovery in Pb concentrate increased by 1.86% compared with that of original system during industrial-scale tests period, and the Pb recovery increased by 4.09% compared with that of original system before industrial-scale tests period, while the Zn operating recovery in zinc oxide concentrate improved by 19.52%. Moreover, the total reagent cost of the whole new process significantly declined by 3.93 yuan per ton of ore. 相似文献
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西太平洋冲绳海槽烟囱硫化物矿床矿石化学特征与分带型式 总被引:12,自引:0,他引:12
西太平洋冲绳海槽烟囱式硫化物矿床分布于琉球弧后扩张盆地、产于尹是名洼陷盆地(深1400m),其特征与日本黑矿类似。硫化物矿石及烟囱主要有3种化学类型:Pb-Zn-Ba型、Zn-Pb型和Cu-Zn型,三者分别代表温度不断升高的热液体系的早、中、晚3个成矿阶段产物,其中,Pb-Zn-Ba矿石及烟囱形成于高fo2环境和高流速、低温、富Pb、Zn、Ba热液体系,Cu-Zn矿石及烟囱形成于低流速、高温、富Cu热液体系,Zn-Pb矿石则介于其间。硫化物烟囱显示明显的矿物-化学分带。在Pb-Zn-Ba矿石(烟囱),Zn、Cd集中于烟囱中央,Ba、Fe、As、Sb、Ag、Pb集中于烟囱外带,Cu则富集于烟囱中外部。在Cu-Zn矿石,As、Sb、Fe、Ag、Au仍富集于烟囱外带,Cu、Zn、Pb则在烟囱中央富集。依此元素化学分带型式,建立了古代黑矿硫化物矿体分带与硫化物堆积模式。 相似文献
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《Resource Geology》2018,68(3):227-243
As a newly discovered medium‐sized deposit (proven Pb + Zn resources of 0.23 Mt, 9.43% Pb and 8.73% Zn), the Dongzhongla skarn Pb–Zn deposit is located in the northern margin of the eastern Gangdese, central Lhasa block. Based on the geological conditions in this deposit of ore‐forming fluids, H, O, C, S, Pb, Sr, and noble gas isotopic compositions were analyzed. Results show that δ18OSMOW of quartz and calcite ranged from −9.85 to 4.17‰, and δDSMOW ranged from −124.7 to −99.6‰ (where SMOW is the standard mean ocean water), indicating magma fluids mixed with meteoric water in ore‐forming fluids. The δ13CPDB and δ18OSMOW values of calcite range from −1.4 to −1.1‰ and from 5.3 to 15.90‰, respectively, show compositions consistent with the carbonate limestone in the surrounding rocks, implying that the carbon was primarily sourced from the dissolution of carbonate strata in the Luobadui Formation. The ore δ34S composition varied in a narrow range of 2.8 to 5.7‰, mostly between 4‰ and 5‰. The total sulfur isotopic value δ34S was 4.7‰ with characteristics of magmatic sulfur. The 3He/4He values of pyrite and galena ranged from 0.101 to 5.7 Ra, lower than those of mantle‐derived fluids (6 ± 1 Ra), but higher than those of the crust (0.01–0.05 Ra), and therefore classified as a crust–mantle mixed source. The Pb isotopic composition for 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb values of the ores were in the ranges of 18.628–18.746, 15.698–15.802, and 39.077–39.430, respectively, consistent with the Pb isotopic composition of magmatic rocks in the deposit, classified as upper‐crust lead. The ore lead was likely sourced partially from the crustal basement of the Lhasa Terrane. The initial (87Sr/86Sr)i value from five sulfide samples ranged from 0.71732 to 0.72767, and associated ore‐forming fluids were mainly sourced from the partial melting of the upper‐crust materials. Pb isotopic compositions of ore sulfides from the Dongzhongla deposit are similar to that of the Yuiguila and Mengya'a deposit, indicating that they have similar sources of metal‐rich ore‐forming solution. According to basic skarn mineralogy, the economic metals, and the origin of the ore‐forming fluids, the Dongzhongla deposit was classified as a skarn‐type Pb–Zn deposit. 相似文献
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峨眉山玄武岩与铅锌矿床成矿关系初探—以云南会泽铅锌矿床为例 总被引:31,自引:4,他引:31
本文以云南会泽铅锌矿为例,从成矿时代、成矿物来源、成矿流体来源和成矿热动力等方面初步讲座主峨眉山玄武岩与铅锌矿床成矿的关系。结果表明:矿床成矿时代可能与峨眉山玄武岩岩浆活动时代相近;峨眉山玄武岩在成矿过程中提供了部分成矿物质;伴随峨眉山玄武岩岩浆活动过程去气作用(包括地幔去气作用和岩浆去气作用)形成的流体参与了会泽铅锌矿成矿流体的形成;峨眉山玄武岩岩浆活动为成矿热动力的主要来源。 相似文献
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枪口南银多金属矿床地处东昆仑多金属成矿带东段,枪口—哈龙休玛海西-燕山期铁、银、铅、锌、铜、金、钼成矿亚带部分,成矿地质条件优越。枪口南银多金属矿区目前已圈定9条矿化带,21个矿体,主要矿种有金、银、铜、铅、锌、钼等,矿石类型主要为构造热液(脉)型铜铅锌银矿石、构造蚀变岩型金矿石。枪口南矿区构造-岩浆活动强烈,印支期—燕山期构造岩浆活动为矿区成矿提供了热源、成矿物质,区内NE向断裂控制区内金、铜、铅锌等矿体的产出,NW向断裂组控制着区内金、银矿(化)体。NW向断裂组,是区内重要控矿构造;区内中部发现的Ⅳ号含矿斑岩体,具有斑岩型矿床蚀变特征,显示其具有斑岩成矿条件。枪口南银多金属矿床成因有构造热液(脉)型、构造蚀变岩型和斑岩型。 相似文献